Fuck all this noise besides >>2503, I don't see enough chemistry on this board (unless there is a dedicated, I'm not certain).
Couple suggestions:
>Elephant toothpaste
Or shock them (did this for kids):
>Get clean, pool HCl (read the fucking MSDS)
>you want only water and HCl
>Get pure NaOH (sodium hydroxide, probably near drain cleaners. Read. The. Fucking. MSDS.)
>Both easily found at hardware stores, just look and read.
>Find out the concentration of HCl
(MSDS)
>Make a similar concentration of NaOH in water
>Prepare all before hand
>Also practice this so you don't fucking kill yourself
>also do it in small amounts, say, when combined, it's 30-40mL
The plan goes as follows:
>Infront of them, with COLD solutions of each
>meaning either freezer or fridge beforehand
>account for frozen solution
>measure out 15-20mL of each
>pour into a shot glass or similar that's sitting on ice
>stir for a second or so
>take the shot
If you're new to acid-base chemistry, this creates salt water
>Proceed to explain the chemistry
>can help